The problem could be caused by a couple of issues. It is either with the switch that is located above the foot, that tells the circuit board when the foot is up or down, or with the circuit board itself. It could also be the lever you lift the foot up and down with. Inside the machine that lever has a plastic "fin" on it that touches the switch. It is possible that the lever is broken. Either way, you need to take it in for service.
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